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The plant cell is reprogrammed and undergoes drastic morphological alterations during infection by viruses. Infection leads to the formation of viral factories, derived from host cell membranes for viral replication. This review discusses the biogenesis of the different viral replication factories that are observed and the impact of their formation on the cell metabolism. The involvement of viral factories in cell-to-cell movement of the virus and modifications of plasmodesmata are also described.